Elevatob appabattjs



3 Sheets-Sheet 1.

Patented Mar. 19, 1895.

J. GREBNHOUGH. EL-EVATOR APPARATUS.

.N BNN (No Model.)

NdI 536,142.

me Noam: PETERS co PHoTcLUTHo, WASHINGTON. D c.

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3 Sheets-Sheet 2.

v(No Model.)

W. J. GRBENHOUGH. BLEVATOR APPARATUS.

Patented Mar. 19, 1895.

WITNESSESI w: Nowms mens on, Puma-wma.. wAsmuamN. o. c.

(No Model.) 3 Sheets-Sheet 3.

W. J. GREENHOUGH.

ELEVATOR APPARATUS.

No. 5,36 PmenteaMar. 19, 1895.

INYEN TOR:

l 5o movable sheaves C2.

e @MT@EDvl 'STASTES' PATENT: OFFICE.

WILLIAM JOHN GREENIIOUGH', OE PHILADELPHIA, PENNSYLVANIA, AS

SIGNOR To THEMOESE, WILLIAMS a COMPANY, -OE SAME PLACE.

ELI-:VATOR APPARATUs SPECIFICATION forming par: pf Letters Patent No. 536,142, dated March 19, 1895.

AppIimionIiIea June 20,1894. seriai'no. 515,143. (No model.)

To all whom t1/mty concern.:

Be it known that I, WILLIAM JOHN GREEN- HOUGH, of the city and' county of. Philadelphia and State of Pennsylvania, have in- 5 vented an Improvement in Elevator Apparaa stop valve at a certain point inthe ascent or descent-of the car or cage, to close'the port to the main cylinder and.l thereby automatically arrest the rapid movement of the elevator car or cage, and avoid vthe sudden and dangerous jar which would occur if the at tendant did not properlyor reasonably operate the usual control valve, or if the control valvev or its operatingdevices were out of order.

It is the object of my invention to provide automatic limit stop devices of improved construct-ion and more positive action and to avoid jolting or jarring-of the car or cage when the limit stop devices operate, so as to bring the car or cage to a gradual stop. v

It is also an object of my invention toenable the devices to be easily adjusted so that the speed of stoppage at the limits may be adjusted, and if desired the limits of operation may be increased or diminished.

Referring now to the accompanyin'gvdrawings forV more particularly.describing my invention: Figure l' is a side elevation of a portion of the lifting devices of an elevator apparat us with the valvechambers in vertical section.` Fig. 2 is aj side elevation ofa continuation of the lifting device of' Fig. l.' Fig. 3 is a transverse sectional view on the line x-. `of Fig. 2 looking to' the left; and Fig. 4 is'a Fig. I.

A i's the main cylinder. B is the'piston working in the cylinder A. C is the piston rod carrying on its end `the frame C in which are journaled the `usual C3 are the usual stationary sheaves.

horizontal sectional view on the line y-y of Q are vthe guiding wheels carried by the frame C and running on tracks R.

D is the control valve cylinder having the inlet and outlet -ports- D', D2, respectively, and the port D3,'\vhich communicates with the cylinder.

E is the usual control valve which is operated from the'traveling car through the usual control cable or cables.

Eis the wheel or lever which is operated by the control cable or cables and moves the valve E through the pinion F.2 and rack E3.

So fa' as the parts have been described they are of well known construction and form no part of the present invention.

. Between the port D3 of the control valve chamberand the port A of the cylinder'Ais a valve chamber F in which is located a stop n yvalve "Gr by which the passage through the chamber F may be opened orclosed.

G is the valve rod of the valve Gand projects through the rear ofthe chamber. The rearend of the valve rod G is 'connected through a pitman G2 with a crank H connected with a sprocket wheel I so asto move with it. The sprocket wheel I is journaled on a suitable stud carried by the main cylinder or by a'stationary frame. I is a second sprocket wheel journaled in a suitable stand` ard I2 inthe rear of the cylinder.

J, J', are two sliding rods guided in suit- .able brackets?, and connected together at either direction will, through these chains K,

K,.tu'rn the sprocket Wheels I, I. The chains K, K and rodsJ, J thus constitute endless, 4bands or chains.

v L, L are clutches carried vby the rods J,J respectively and moving with them.l These 'clutches are respectively adapted to receive clutch engaging parts, here shown as blocks orheads M,Mcarred by a t'rameM2 secured to and Inoving with ythe'frarne C. The

' clutchesL, L are Simultaneously'and oppositely moving engaging pieces adapted,vwhen operated, to impart .motion to the stop valve through the power transmitting connections;

and the frame M,2 with the 'heads M, M is a device carried vby the piston actuated frame for moving the simultaneously and oppo- Sitely moving engaging pieces.

The clutches L, L and blocks or heads M, M' constitute locking devices for automatically locking the rods J, J' to the moving head C', and thereby imparting movement to the wheel I and crank H and operating the stop valve. The special form of these locking devices is not material. I have shown my preferred construction in which I em ploy clutches each composed of two dogs L2, L3, pivoted to a collar L4 adj ustahly carried on the rod, the dog L2 being provided with a counterweighted extension L5 and also with a nose piece or trigger L6,and the dog L3 with a toe piece LT adapted to be acted upon by the nose piece or trigger LG of the dog L2. The Weighted extension Lr normally holds the dogs in the position shown in Fig. 2. It is apparent that by throwing the weighted eXtension to the rear the dogs L2, Lwill be opened, thetrigger L6 acting on the toe L7 to lift the dog L3.

The blocks or heads M, M', may slide upon the guide rods J, J respectively.

N is a stationary rod or bar carried by the brackets J2 and extending adjacent to the bar 01 rod J'.

O, O are trips carried by the bar Naud located respectively adjacent to the clutches L, L', on the rods onbars J, J', in position to act upon the extensions L5 thereof. These trips are located slightly in advance of the clutches so as to permit the clutches to move to some extent before they are actuated. The trips t), O may be adjustably supported on the rod N as by the collars O2, and may be provided with rollers P upon their operative ends as shown.

I shall now describe the operation of the apparatus.

The elevator cage is operated by the movement of the piston C in the usual manner; and the movements are controlled by the operation of the control valve E. The stop valve G normally occupies a position which will leave the inlet A' to the cylinder A slightly open, just enough to admit suflieieutwater to start a gradual movement of the piston B when the control valve is opened. Supposing the parts to be in the positions indicated in Figs. l and 2 with the elevator lowered, the control valve closed and the block or head M held by the clutch L; when the control valve is opened to admit fluid to the chamber F, the slight amount which passes through the partially opened valve G will enter the cylinder A and move the piston B with agradual movement. As the piston moves, the head or frame C is correspondingly moved, and as the clutch L is locked to the head M, which is carried by the frame C', the rod J to which the clutch L is,

secured will be similarly moved. This movement of the rod J will turn the sprocket wheel l through the chain K, and thus, through the crank H, pitman G2 and rod G', will operate the valve G, opening it and permitting the Water to flow freely into the cylinder A. At

this moment the trip O strikes the extension L5 of the clutch and opens it releasing the head M and permitting the frame C to move without further movement of the rod J andthe stop valve. The elevator car may then ascend at full speed under the control of the control valve E. As the limit of upward movement is reached the frame C has been moved Ato the rear until the block or head M' secured thereto strikes the clutch L' and is engaged by it. As the head or block M strikes the clutch L' it moves it and the rod J' back. This movement of the rod J turns the sprocket Wheel I, and, through the crank H and its connections, restores the valve G to to its approximately closed position. The rapid movement of the elevator or car will thus be arrested and the car will be quietly stopped. The valve G will not. ordinarily be entirely closed, but if through any cause the control valve should not be operated properly to actually stop the cage after the limit is reached,the movement of the piston and head C' beyond the limit will be sufficient to move the valve G far enough to positively close the stop valve. rlhe apparatus thus acts as a safety device to positively stop the car after the properlimitof movement has been passed. In descending the operations are exactly reversed. When the control valve is operated to permit the water to be discharged from the cylinder, the Water will at first gradually pass through the slightly opened valve G and permit a slight movement to the piston l, under the weight of the descending cage. As the frame C moves back the clutch L' being locked to the head M' is carried with it and thus the rods J, J' are moved and the valve' G is opened as has been described. The trip O then opens the clutch L' and the frame C travels back until the li mitof downward movement is approached when the frame M strikes the clutch L and moves it back, thus closing the valve G and arresting the rapid descent of the cage. At the same time the clutch L eugages the head M and the parts are again in the position shown in Figs. 1 and 2. As the closing of the stop valve to arrest the rapid ascent or descent ot the elevator car is accomplishedby the movement imparted to the chain through the clutches and heads, it is apparent that a quick and positive action is obtained, and as the valve is only approximately closed under normal conditions, the sudden jar, that would result from a quick fullclosng of the valve, is avoided. The said movement of the elevator is thus automatically arrested and changed into a slow movement at the limits of ascent and descent and all sudden jolting is avoided.

The advantage of employing the endless chain construction is that the stop valve is moved in the same direction at the limit of the movement oi' the frame Ceither back: Ward or forward.

By employing the crank I-l to impart the ITO . rod G with the sections united by anadjusting joint T,so that by adjusting the joint T to extend or ashortenthe'rod G the crank H may be moved to the right or left to increase y of the movement of the valve G to adjust the` or diminish its throw and thus vary the speed length of the movement of piston before the operationot' the stop valve. I prefer to make the clutches L, L', adjustable longitudinally upon the rods J, J as by the set collars shown. The stops O, O may also be made adjustable in a similar manner upon the rod N. l

The minor details ot construction lshown may be varied without departing from the invention.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is'- 1. In an elevator apparatus, the combination with the main cylinder, and the hoisting piston and frame, of a stop valve for controlling the port to the main cylinder, a crank, connections between the crank and stop valve, a movable clutch adjacent tothe frame, power transmitting connections between the crank and clutch, a clutch engaging part carriedwith the movable piston frame, and a the clutch engaging part after a given movement.

, 2. In an elevator apparatus, the, combination with the main cylinder, and the hoisting piston and frame, of a stop valve for controlling the port to the main cylinder, a crank, adjustable connectionsr between the crank and stop valve, a movable clutch adjacent to the frame, power transmitting connections between the crankand clutch, a clutch engagingrpart carried with the movable piston frame, and a trip arranged to operate the clutch and. release the clutch engaging part after a given movement.

3. In an elevator apparatus, the combination with the main cylinder and the piston f and piston operated frame, ot' a' stop valve Vfor controlling the port to the main cylinder,

an endless chain or band independent of thel piston operated frame, power transmitting connections between the endless' chain or band and the-stop'valve, and intermittently.

acting clutch devices between fthe movable piston operated frame'and the endless chain or band, whereby at certain intervals in the movement of the piston operated frame the endless band is clutched'and actuated, therebyactuating the stop valve.

l ,4. In an elevator apparatus, the combination with the main cylinder and the piston and piston koperated frame, of a stop valve Afor controlling the movement of the motor Huid in the cylinder, mechanism for operating the stop valve, two engaging pieces, oppositely acting connections between said en gaging pieces and the valve operating mechanism so as to impart relatively opposite movements to the valve operating mechanism when said two engaging pieces are moved in the same direction, and a device controlled by the move- -then close the stop valve.

5. In an elevator apparatus, the combination with the main cylinder and the piston and piston operated frame, of a stop valve for controlling the port to the main cylinder,` a band or chain, power transmitting connections between the movable band or chain and the stop valve clutch mechanism between the piston operatedA frame and the movable band or chain adapted at certain intervals to connect the band or chain with the piston operated frame and thereby cause the band to move and operate the stop valve, and avtrip arranged inthe path of the clutch mechanism to unclutch it and release the band or chain.

IOO

6. In an elevator apparatus, the combinal tion with the main cylinder and the piston and the piston operated frame, of a stop valve adapted to control the port to the main cylinder, a `movable band or chain, kpower transmitting connections between the movablel band or chain and the stop valve, a clutch carried by the band or chain, aclutch engaging part carried with the movable piston operated frame and adapted at certain intervals toengage the clutch and move the band or chain and thereby operate the stop valve, and a trip located on the path of the clutch to unclutch it after a given movement. 1

7. In an elevator apparatus, the combination with the main cylinder and the piston and the piston operated frame, a stop valve adapted to control the port to the main cylinder, a movable band or chain embracing a bar J', a clutch L carried by the bar J with the freedom of longitudinal adjustment thereon, a clutch engaging part carried with the movable piston actuated frame adapted at certain intervals to engage the clutch and move the band or chain, a trip to release the clutch after a given movement, and power transmitting connections between thevband or chain `and stop valve.

8. In an elevator apparatus, the devicesfor automatically operating a stop Valve of the main cylinder, consisting of movable endless IOS g IIO chain orband embracing bars J, J', clutches part moving with the piston of the main cylinder and adapted to engage either of the clutches carried by the bars J, J', and thereby move the chain or band, trips for releasingF the clutches after a given movement, and power transmitting connections between 'the chain or band and the stop valve.

9. In an elevator apparatus the combina` tion with the main cylinder and the piston and piston operated frame, of the stop valve for controlling the movement of the motor fluid in the main cylinder, an endless chain or band, power transmittingr mechanism between the chain or band and the stop valve, a clutch device carried bythe endless chain or band on one side thereof, a second clutch de- WILLIAM JOHN GREENHOUGH.

Witnesses:

ERNEST HOWARD HUNTER, C. II. NEWCOMB. 

